Hahhaa, that it is. I once totaled up how much my second version of The Honey Badger cost me. Close to about £400 but then again, I was things like a pricey transmitter at the time and such.
Team Kaizen - Build Diary for all the robots
AW: Amai, Ikari, Lafiel, Osu, Ramu
BW: Shu!, The Honey Badger
FW: Azriel
MW: Jibril, Kaizen
The thing is, as a one off, it is expensive, yes but you do end up reusing tools and components from one machine to the next as you go along. My Middleweight needs a new body but the parts from the current version can easily be transplanted so that will only cost me about £300 or 400 to get the parts and for me to machine them to make it work.
Team Kaizen - Build Diary for all the robots
AW: Amai, Ikari, Lafiel, Osu, Ramu
BW: Shu!, The Honey Badger
FW: Azriel
MW: Jibril, Kaizen
Expenses wise, the worst part is always starting up. Once you're up & running it's not so bad & as Lucy said the vast majority of it can be reused & more expensive things like transmitters usually don't get damaged in combat. I've had a pretty rough run over the last couple of events (1 lipo fire, 1 other lipo die & multiple big hits from spinners) but once I've added it up it was less than half what I spent on the hotels for the events.
Yeah most of it is reusable thankfully! Just gotta price up the HDPE once got the design finalised.
LiPo and chargers ordered and dispatched from hobby king, so think I have everything I need now
Im sure i remembering reading it on here before but looked in many threads and cant find it.
How do I work out what fuse size I need for this; https://hobbyking.com/en_us/turnigy-...ack-xt-90.html
The max current from your battery is the capacity in Ah multiplied by the C rate (in this case you have a burst and continuous C rate, so use the lower of the two, i.e., the continuous rating). That's 4.0 Ah x 60 C = 240 A. The fuse must be less that that.
However, with two drill motors and a linac you'll never get close to 240 A. So to protect your motors and ESCs you are probably better off with something around the 100 A mark, or even less. We have an 80 A fuse for a similar setup to yours.
You work out the burst amperage of the battery and get a fuse below that amperage as per the rules:
So in that particular batteries case, it is 4 amps * 120C = 480amps (240amps constant). That, to me, sounds crazy and you'll likely never draw that much. I'd figure on it being a quarter of that, so 120amps but from experience, a 60 or 80amp fuse will be sufficient. I've yet to blow a 80A fuse in either my Featherweights or my Middleweights.7.8.3 Fusing
A fuse rated below the maximum burst discharge of the battery MUST be fitted. The maximum burst discharge current is calculated by multiplying the C rating by the capacity. E.g. 25C 2200mAh = 55 Amp
Last edited by Ocracoke; 17th July 2019 at 08:54.
Team Kaizen - Build Diary for all the robots
AW: Amai, Ikari, Lafiel, Osu, Ramu
BW: Shu!, The Honey Badger
FW: Azriel
MW: Jibril, Kaizen
Looks like we're largely in agreement here Lucy!
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